Phoenix Contact PSR-SCP-24UC/ESL4/3X1/1X2/B Safety Relay, 24V AC/DC

The Phoenix Contact PSR-SCP-24UC/ESL4/3X1/1X2/B safety relay is a high-performance component engineered for critical industrial automation and control systems. Operating at a nominal input voltage of 24V AC/DC, this module provides reliable signal processing and circuit protection, ensuring the operational integrity of complex electrical installations. Its robust construction is specifically designed to meet the rigorous demands of industrial environments, offering essential safety functions for various types of machinery and equipment.

Advantages

This safety relay excels in providing high-level protection for personnel and equipment by supporting safety functions up to SIL 3, Cat. 4, and PL e standards according to EN ISO 13849. The device offers versatile configuration options, allowing for both single-channel and two-channel operation to suit specific safety requirements. With three enabling current paths, it provides flexible integration into existing safety circuits. The inclusion of plug-in screw terminal blocks simplifies the installation and maintenance process, allowing for quick connection and replacement without complex wiring adjustments.

Suitable for

• Emergency stop monitoring
• Safety door monitoring
• Light grid monitoring
• Industrial machinery safety circuits

This relay may not be suitable for applications requiring high-voltage switching beyond its specified current path ratings or for environments where non-standard input voltages are used. It is also not intended for use in systems that do not require safety-rated monitoring or where space constraints prevent the installation of standard DIN-rail mounted safety modules.

Key specifications

• Nominal input voltage: 24 V AC/DC
• Safety integrity level: Up to SIL 3
• Performance level: Up to PL e
• Category: Cat. 4
• Enabling current paths: 3
• Connection method: Plug-in screw terminal blocks
• Operation modes: Single or two-channel

To use the safety relay, mount the device onto a standard DIN rail within a control cabinet. Connect the safety sensors, such as emergency stop buttons or light grids, to the input terminals according to the required single or two-channel configuration. Ensure that the power supply is connected to the 24V AC/DC input terminals. Finally, wire the enabling current paths into the machine control circuit to interrupt power in the event of a safety trigger. Always verify the wiring against the technical documentation before applying power.

What to consider before purchase

• Verify that the 24V AC/DC input voltage matches your control system requirements.
• Ensure the safety category (Cat. 4/PL e) meets the risk assessment of your machinery.
• Check available space in the control cabinet for DIN rail mounting.
• Confirm that the number of enabling current paths is sufficient for your safety circuit design.

Usage recommendations: Regularly test the safety function of the relay and the connected sensors to ensure continued compliance with safety standards. Ensure that all terminal connections are tightened securely and inspected periodically for signs of wear or oxidation.